<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>盒模型</title>
		<style>
			div{
				width:300px;
				height: 300px;
				border: 1px solid red;
				margin: 100px;
				margin: 10px 100px;
				margin: 10px 20px 100px;
				margin: 10px 20px 30px 100px;
				margin: 0 auto;
				margin-top: 100px;
				padding: 50px;
				padding: 50px 100px;
				padding: 50px 100px 200px;
				padding: 50px 100px 200px 300px;
				
				}
		</style>
	</head>
	<body>
		<div></div>
	</body>
</html>